Polyscience recirculator chiller. Although not intended for aquariums, it works great as a aquarium chiller. It is not only capable of cooling, but heating as well so it will keep your temp. at what ever you set it at. I was going to use it on my 240 but decided to go with led instead of metal halide. $300 or trade for saltwater equipment or preferably a tank and stand. http://www.sci-support.com/items/1627.htm